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Code:
/private/var/vm/

It is in the folder I posted above. Not sure how you would move it and keep it moved.
 
You can just replace the /vm folder with a Unix Symlink (created easily via this) that redirects to the drive of your choice.

It MUST be a Unix symlink, OS X aliases do not work for kernel-level programs (such as dynamic_pager, OS X's swapfile management daemon)

This also has the significant advantage of leaving the com.apple.dynamic_pager LaunchDaemon completely alone, meaning you don't need to tinker with reprogramming system files.

Works great with my multi-drive multi-partition Macbook Pro.
 
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