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