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