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