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