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