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