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