riff 1:
|--------------------------------------------------|
|-5-5--555---5-55--555----5-5-555---5-55-----------|
|-4-4--444---4-44--444----4-4-444---4-44--4/5-4p0--|
|-2-2--222---2-22--222----2-2-222---0-00--0---0----|
|-0-0--000---3-33--333-0--x-x-xxx------------------|
|-------------------------3-3-333------------------|

you can also play riff 1(this is good if you have a band w/2 guitars):

|------------------------------------------------------------|
|------------------------------------------------------------|
|------------------------------------------------------------|
|--7-7--777--10-1010-101010------5-5--555--12-1212-----------|
|--7-7--777--10-1010-101010------5-5--555--12-1212-----------|
|--5-5--555--8--8-8--8-8-8---0---3-3--333--10-1010--7h8-7/5--|

riff 2:

|--------------------------------------------------|
|-2222---------------------------------------------|
|-2222---------------------------------------------|
|-2222-----5555------------5555--7777--------------|
|-0000--2--5555--2h3-2p0---5555--7777---2h3-2p0----|
|----------3333------------3333--5555--------------|

riff 3 (also played under solo part; it starts off w/ no
distortion then they kick in it later):

|--------------------------------------------------|
|--------------------------------------------------|
|--------------------------------------------------|
|--7-------10-------5-------12---------------------|
|--7--x9---10--x8---5--x8---12--x8-----------------|
|--5-------8--------3-------10---------------------|

Solo part (play a bunch of times):

|--------------------------------------------------|
|---4-4-4-2-4br-4-2--------------------------------|
|--------------------------------------------------|
|--------------------------------------------------|
|--------------------------------------------------|
|--------------------------------------------------|

Key:
br: bend and release
/: slide
h: hammer
p: pull off
x: precussive note