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