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