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