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