Main riff:

G---------------------------------------|
D---------------------------------------|
A--------------5-6-7--------------------|
E--6--6-5-------------5-6-7-8-----------|

Chorus: slide up and down the fret and play that A note when necessary

Little bit after the guitar solo

G-------------------------------------------------------------------------|
D-------------------------------------------------------------------------|
A---------/6-5-6-5-------/8-7-8-7--------/6-5-6-5--------5-6-7------------|
E---5---------------5--------------5---------------5------------5-6-7-8---|

Enjoy!