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