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