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