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