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