[jonty]

I actually had a version using force-directed layout very similar to yours, took me a while to decide on this version!

Each colour is a verse, fading through the spectrum.

An unfilled arrowhead shows a transition between words in a line of a verse, a filled arrowhead shows a transition between lines.

[jojohack]

That's a pretty neat approach, maybe I should do something similar. Originally I color-coded the words (based on frequency) but having a gradual spectrum applied to the edges feels a lot more intuitive.