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