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