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