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