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