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