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