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