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