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