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