The following links relate to things discussed on the Group Explorer
web site. If you know of a page that would go well here, please let
me know (ncarter@bentley.edu).
The link above is to the "pictures" page in Marcus's site, which
has many visualizations of algebraic objects, concepts, operations,
proofs, etc. He does some Cayley diagrams.
John Meier and Cliff Reiter have written a paper on
computer-generated Cayley diagrams for infinite groups, and how using
fractal concepts makes the whole group visible within a bounded
region.