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)(11,16)(12,13)(14,15)(17,18)(19,22)(20,24)(21,23)(25,26,28,30)(27,29,31,32)(1,3,6,4)(2,7,5,8)(9,11)(10,13)(12,14)(15,16)(17,19,21,24)(18,22,23,20)(27,31)(29,32)(3,4)(7,8)(10,15)(11,12)(17,19)(18,20)(21,24)(22,23)(25,26)(27,29)(28,30)(31,32) involution — undirected(1,4,6,3)(2,7,5,8)(9,12,14,11)(10,16,15,13)(17,19)(18,20)(21,24)(22,23)(25,27)(26,29)(28,31)(30,32)(1,5,6,2)(3,7,4,8)(9,13,14,16)(10,11,15,12)(17,20)(18,19)(21,22)(23,24)(25,26)(27,29)(28,30)(31,32)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.