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