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