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