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