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