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