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