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