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