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