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