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