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