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