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