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