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