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