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