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