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