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