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