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