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