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