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