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