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