You can try this tools:
- ant2dot - using GraphViz toolkit to generate the final graph;
- Vizant - using GraphViz toolkit to generate the final graph;
- Grand - using GraphViz toolkit to generate the final graph;
- ant-script-visualizer - using GraphViz toolkit to generate the final graph.
The IntelliJ IDEA has a very good support (has native plugin and several 3rd party plugins) of Apache Ant. You can read about Ant support in IDEA here.
