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