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