The state_machine gem Show archive.org snapshot comes with a rake task that lets you generate PNG graphs from any model using state_machine.

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Install the required dependencies like this:

sudo apt-get install graphviz
sudo gem install ruby-graphviz

You can now generate a graph like this:

rake state_machine:draw CLASS=ModelUsingStateMachine

Replace ModelUsingStateMachine with the name of your model class.

If it the raketask does not exist for you, add to Rakefile (in your project root):
require 'tasks/state_machine'