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