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