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