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