This is not the exact way its supposed to be played, I'm just providing easier shapes 
for beginners to learn.

---------------------------------------------------------------|
---------------------------------------------------------------|
-66x--99x------------------------------------------------------|
-66x-999x--99x--77x--------------------------------------------|
-44x-7-7x-999x-777x--------------------------------------------|
----------7-7x-5-5x--------------------------------------------|

x=palm mute

you can also play the power chords straight through if you'd like without skipping 
strings, i just prefer my way though because it sounds slightly better.