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