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