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