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