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