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