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