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