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