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