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