One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(17,18,23,27)(19,28,32,42)(20,33,34,47)(21,26,22,37)(24,30,39,31)(25,35,40,36)(29,43,44,38)(41,45,48,46)(1,3,5,4)(2,6,8,7)(9,10)(11,14)(12,13)(15,16)(17,19,21,30,23,32,22,31)(18,24,37,42,27,39,26,28)(20,29,35,45,34,44,36,46)(25,38,47,48,40,43,33,41)(1,3,5,4)(2,7,8,6)(10,13)(14,16)(17,20,22,36,23,34,21,35)(18,25,26,33,27,40,37,47)(19,29,31,46,32,44,30,45)(24,38,28,41,39,43,42,48)(1,3,5,4)(2,7,8,6)(9,11)(10,14)(12,15)(13,16)(20,34)(25,40)(29,44)(33,47)(35,36)(38,43)(41,48)(45,46)(1,4,5,3)(2,6,8,7)(11,15)(14,16)(17,21,23,22)(18,26,27,37)(19,30,32,31)(20,35,34,36)(24,28,39,42)(25,33,40,47)(29,45,44,46)(38,41,43,48)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.