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