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