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