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