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