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