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