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