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