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