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