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