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