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