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