You can use this java code to generate the tree:

http://www.keithschwarz.com/interesting/code/ll1/ParseTree.java.html

Once you get the nodes u can create the graph with this code:

http://algs4.cs.princeton.edu/40graphs/

Thanks for d answer

Did you have a look to this ? It is based on the JUNG java library.

http://www.cis.upenn.edu/~ccb/publications/visualizing-data-structures-in-parsing-based-machine-translation.pdf