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