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