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