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