Not an XSL, but it is better than that.

Here is a deadlock shredder by Wayne Sheffield.

http://blog.waynesheffield.com/wayne/code-library/deadlocks/shred-deadlock-graph/

You can take the xml from the graph that is produced by XE and just pass it as a parameter if you like.

You can also retrieve it directly from the XE session.

This shredder is highly efficient and will shred those nasty multi-victim deadlocks.