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