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