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