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