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