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