E|-----------------------|
B|-----------------------| I think there is some sort of delay
G|---10-p-8--------------| or double effect used on the riff, but
D|----------10-8---------| I suppose you could just play the 1st
A|-3-------------11-8----| note of the descending riff twice.
E|-1------------------11-|

E|----------|
B|----------|
G|----------|
D|--------3-|
A|-3-6--3-1-|
E|-1-4--1---|

E|-----------------------|
B|-----------------------|
G|---10-p-8--------------|
D|----------10-8---------|
A|-3-------------11-8----|
E|-1------------------11-|

E|-------|
B|-------|
G|-------|
D|-6--4--|
A|-4--3--|
E|-------|

p = pull-off

This way of playing sounds best, but could be hard if you only have
one guitarist, with two guitarists one could play the chords and one
play the lead. So, here's an alternative version for those of you who
only have one guitarist. It doesn't sound quite as good, but the actual 
notes are the same and it is closer to the chords. Good Luck.

##################
#Alternative Riff#
##################

E|-------------------|
B|---6-p-4-----------|
G|---------5-3-------|
D|-------------6-3---|
A|-3---------------6-|
E|-1-----------------|

E|----------|
B|----------|
G|----------|
D|--------3-|
A|-3-6--3-1-|
E|-1-4--1---|

E|-------------------|
B|---6-p-4-----------|
G|---------5-3-------|
D|-------------6-3---|
A|-3---------------6-|
E|-1-----------------|

E|-------|
B|-------|
G|-------|
D|-6--4--|
A|-4--3--|
E|-------|

#######
#Verse#
#######

E|----------------------------------|
B|----------------------------------|
G|----------------------------------|
D|----------------------------------|
A|-3----------3----------3----------|
E|-1--1-1-1-1-1--1-1-1-1-1--1-1-1-1-|

E|----------|
B|----------|
G|----------|
D|--------3-|
A|-3-6--3-1-|
E|-1-4--1---|

E|----------------------------------|
B|----------------------------------|
G|----------------------------------|
D|----------------------------------|
A|-3----------3----------3----------|
E|-1--1-1-1-1-1--1-1-1-1-1--1-1-1-1-|

E|-------|
B|-------|
G|-------|
D|-6--4--|
A|-4--3--|
E|-------|

Then play it an octave higher, unless you have a whammy pedal, in
which case you can just set that to play on octave higher, as this
sounds better than playing on higher strings, especially on older
guitars.