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