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