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