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