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