One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,6)(7,8)(25,26,30,35,31,36,29,34)(27,37,41,45,38,47,40,32)(28,33,43,49,42,48,44,50)(39,51,53,55,52,56,54,46)(1,3,4,7)(2,5,6,8)(9,10)(11,17)(12,15)(13,16)(14,19)(18,23)(20,22)(21,24)(25,27)(26,32)(28,39)(29,41)(30,40)(31,38)(33,46)(34,37)(35,47)(36,45)(42,52)(43,54)(44,53)(48,55)(49,56)(50,51)(2,6)(5,8)(9,11,13,19)(10,14,16,17)(12,20,21,18)(15,23,24,22)(27,38)(28,42)(32,45)(33,48)(37,47)(40,41)(43,44)(49,50)(9,12,13,21)(10,15,16,24)(11,18,19,20)(14,22,17,23)(25,28,31,42)(26,33,36,48)(27,39,38,52)(29,44,30,43)(32,46,45,55)(34,50,35,49)(37,51,47,56)(40,54,41,53)(10,16)(14,17)(15,24)(22,23)(25,29,31,30)(26,34,36,35)(27,40,38,41)(28,43,42,44)(32,47,45,37)(33,49,48,50)(39,53,52,54)(46,51,55,56)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.