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