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