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