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