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