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