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