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