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