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