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