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