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