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