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