One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,5)(3,6,7,8)(17,18)(19,23)(20,22)(21,25)(24,28)(26,30)(27,29)(31,32)(2,5)(6,8)(9,10)(11,15)(12,14)(13,16) involution — undirected(1,3,4,7)(2,6,5,8)(9,11)(10,13)(12,16)(14,15)(18,22)(20,28)(23,29)(24,25)(27,32)(30,31)(11,16)(13,15)(17,19,21,26)(18,23,25,30)(20,27,28,32)(22,29,24,31)(10,14)(13,15)(19,26)(23,30)(27,32)(29,31) involution — undirectedA 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.