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)(19,24)(20,32)(21,26)(22,36)(23,27)(25,34)(28,41)(29,38)(30,39)(31,45)(33,40)(35,46)(37,44)(42,48)(43,47)(1,3,4,8)(2,5,6,7)(9,10)(11,15)(12,16)(13,14)(17,19)(18,24)(20,28)(21,30)(22,31)(23,29)(25,37)(26,39)(27,38)(32,41)(33,43)(34,44)(35,42)(36,45)(40,47)(46,48)(3,8)(5,7)(10,14)(15,16)(17,20,21,33,23,35,22,34)(18,25,36,46,27,40,26,32)(19,28,30,43,29,42,31,44)(24,37,45,48,38,47,39,41)(2,6)(5,7)(9,11,13,12)(10,15,14,16)(19,29)(24,38)(28,42)(30,31)(37,47)(39,45)(41,48)(43,44)(9,12,13,11)(10,15,14,16)(17,21,23,22)(18,26,27,36)(19,30,29,31)(20,33,35,34)(24,39,38,45)(25,32,40,46)(28,43,42,44)(37,41,47,48)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.