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