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