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