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