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