Watching a video, I saw that the guitarist shifted.  So here''s one way to play
it:
e||
B||
G|5-| repeat
D|-5h7-7-5h7-712p11-12p115h7-7-77-5-5-|
A||
E||

This is the same, but it''s easier to play because you don''t have to shift.

e||
B||
G|-7p5-7p5-5| repeat
D|5h7-7-5h7-7-5h7-7-77-5-5|
A||
E||

^^^^^^^^^^^^^^
I play this one for the intro because I can get more of the distortion.

To play the rest of the song, I suggest playing the one pighinator chorded.  If
you notice, you can still hear the riff through out the song.  So when you play
the A chord. 

Just imagine this tab for the riff...

e|-|
B|3p23p2-|
G|0h220h22-0h222200| 
D|-|
A|-|
E|-|

...and blend it in with the A chord like this

e|000000-000000|
B|22223p23p2-222222|
G|0h220h2222-0h222200|
D|222222-222222|
A|000000-000000|
E|-|