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