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