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