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