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