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