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