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