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