Okay, messing aorund with this song, came up with this, play around with the rythym and 
pick it up, sounds about right.

play this part throughout the verse's and chorus'
-------------------------|
-------------------------|
--10--10--12-------------|
--10--10--12-------------|
--8---8---10-------------|
-------------------------|
countinue playing the last chord until it starts again if you feel like it.

On the quiet part play it muted with an occasional chord.

---x----x-----------------|
---x----x-----------------|
---x-12-x-----------------|
---x-12-x-----------------|
---x-10-x-----------------|
---x----x-----------------|

As it speeds up play this repeatedly until it kicks back in with the main riff.

--------------------------|
--------------------------|
---12/13/12---------------|
---12/13/12---------------|
---10/11/10---------------|
--------------------------|

Like i said, not exact but mess around it with and you'll pick up a rythym :)