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