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