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