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