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