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