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