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