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