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