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