One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,6)(7,8)(9,10,14,18)(11,19,21,15)(12,16,13,17)(20,24,22,23)(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)(1,3)(2,5)(4,7)(6,8)(9,11,14,21)(10,15,18,19)(12,20,13,22)(16,23,17,24)(26,32)(27,37)(34,41)(35,45)(38,52)(39,40)(48,49)(54,55)(2,6)(3,7)(9,12,14,13)(10,16,18,17)(11,20,21,22)(15,23,19,24)(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)(9,12,14,13)(10,17,18,16)(11,20,21,22)(15,24,19,23)(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)(3,7)(5,8)(9,13,14,12)(10,17,18,16)(11,20,21,22)(15,23,19,24)(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.