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