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)(14,16)(17,18,23,19)(20,28,30,32)(21,26,22,25)(24,31,27,29)(2,5)(6,8)(9,10)(11,14)(12,13)(15,16)(17,19,23,18)(20,27,30,24)(21,26,22,25)(28,29,32,31)(10,13)(14,16)(17,20)(18,24)(19,27)(21,29)(22,31)(23,30)(25,28)(26,32) involution — undirected(1,3,4,7)(2,6,5,8)(11,15)(14,16)(17,21,23,22)(18,25,19,26)(20,29,30,31)(24,28,27,32)(9,11,12,15)(10,14,13,16)(17,21,23,22)(18,26,19,25)(20,29,30,31)(24,32,27,28)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.