One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10,13,16)(11,17,19,14)(12,20,21,15)(18,22,24,23)(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)(10,14)(12,18)(13,19)(15,22)(16,17)(20,23)(21,24)(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)(2,5)(6,8)(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)(9,12,13,21)(10,15,16,20)(11,18,19,24)(14,22,17,23)(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)(1,3,4,7)(2,6,5,8)(11,19)(14,17)(18,24)(22,23)(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.