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