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