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