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