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