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