One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,10,6,9,4,8)(3,11,12,16,13,7,14,15)(17,18,21,26,22,23,20,30)(19,27,28,24,29,25,31,32)(18,23)(20,21)(25,27)(28,31) involution — undirected(1,3,6,13)(2,7,9,11)(4,12,5,14)(8,15,10,16)(17,19)(18,24)(20,31)(21,28)(22,29)(23,32)(25,26)(27,30)(1,4,6,5)(2,8,9,10)(3,12,13,14)(7,15,11,16)(17,19)(18,25)(20,28)(21,31)(22,29)(23,27)(24,26)(30,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.