One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(13,16)(17,18,21,24)(19,28,25,32)(20,30,31,29)(22,27,23,26)(2,5)(6,8)(11,15)(13,16)(18,24)(20,31)(26,27)(28,32) involution — undirected(1,3,4,7)(2,6,5,8)(9,10)(11,13)(12,14)(15,16)(17,19)(18,20)(21,25)(22,30)(23,29)(24,31)(26,32)(27,28)(9,11)(10,13)(12,15)(14,16)(17,20,21,31)(18,25,24,19)(22,28,23,32)(26,30,27,29)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.