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