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