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