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