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