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