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