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