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