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