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