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