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