Graph visualization

I want to experiment with graphs but don't want deal with their visualization. What is the easiest way to visualize graphs? I heard about graphviz but never actually worked with it.
The main intention is to experiment with maze/dungeon generation for a simple exploration game.

>>1
I've used Graphviz for a graph to map visualization project and it worked well. You can generate the graph files yourself and render them with Graphviz or you can use the Graphviz library in your code. The hardest part about using Graphviz was the installation.