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