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