The main tab is just this repeated, with a few minor changes in some parts:

G|------------------------------|
D|------------------------------|
A|---7----7-1-0-1-0-2-----------|
E|0-----0-------------3--5*--7*-|
*only play every other time

And then right before the guitar part comes in play this:

G|-----------------------------|
D|-----------------------------|
A|---7----7-1-0-1-0-2----------|
E|0-----0-------------3---7777-|