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