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