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