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