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