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