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