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