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