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