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