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