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