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)(19,25)(20,27)(23,28)(24,29)(33,34)(35,40)(36,43)(37,39)(38,41)(42,47)(44,48)(45,46)(1,2)(3,5)(4,6)(7,8)(18,22)(23,28)(24,29)(30,32)(33,35,39,36)(34,40,37,43)(38,42,46,44)(41,47,45,48)(3,8)(5,7)(9,10,12,14)(11,13,15,16)(17,18,21,22)(19,23,25,28)(20,24,27,29)(26,30,31,32)(33,36,39,35)(34,40,37,43)(38,44,46,42)(41,47,45,48)(1,2)(3,5)(4,6)(7,8)(9,11)(10,13)(12,15)(14,16)(17,19,21,25)(18,23,22,28)(20,26,27,31)(24,30,29,32)(33,37,39,34)(35,40,36,43)(38,45,46,41)(42,47,44,48)(1,3,4,8)(2,5,6,7)(17,20)(18,24)(19,26)(21,27)(22,29)(23,30)(25,31)(28,32)(33,38,39,46)(34,41,37,45)(35,42,36,44)(40,47,43,48)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.