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