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