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