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)(20,27)(22,29)(24,31)(26,28)(30,32) involution — undirected(2,5)(6,8)(9,10)(11,14)(12,13)(15,16)(17,18)(19,22)(20,24)(21,23)(25,29)(26,30)(27,31)(28,32) involution — undirected(10,13)(14,16)(17,19,21,26)(18,22,23,30)(20,28,27,25)(24,32,31,29)(1,3,4,7)(2,6,5,8)(9,11)(10,14)(12,15)(13,16)(19,26)(22,30)(25,28)(29,32)(11,15)(14,16)(18,23)(19,26)(24,31)(25,28) 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.