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