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