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