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