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