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