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