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