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