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