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