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