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