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