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