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