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