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