One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,11)(4,8)(5,18)(6,9)(7,15)(10,19)(12,25)(13,22)(14,21)(16,29)(17,23)(20,28)(24,30)(26,32)(27,31)(33,34)(35,40)(36,48)(37,42)(38,51)(39,43)(41,49)(44,58)(45,54)(46,55)(47,61)(50,56)(52,57)(53,59)(60,63)(62,64) involution — undirected(1,3)(2,7)(4,12)(5,13)(6,14)(8,20)(9,22)(10,21)(11,18)(15,19)(16,26)(17,27)(23,32)(24,31)(25,29)(28,30)(33,35)(34,40)(36,44)(37,45)(38,47)(39,46)(41,53)(42,54)(43,55)(48,58)(49,59)(50,60)(51,61)(52,62)(56,63)(57,64) involution — undirected(1,4,6,17)(2,8,9,23)(3,12,14,27)(5,16,19,30)(7,20,22,32)(10,24,18,29)(11,25,21,31)(13,26,15,28)(33,36,39,50)(34,41,43,57)(35,44,46,60)(37,49,38,52)(40,53,55,64)(42,56,51,48)(45,59,47,62)(54,63,61,58)(3,13)(5,19)(7,21)(10,18)(11,22)(12,26)(14,15)(16,30)(20,31)(24,29)(25,32)(27,28)(33,37,39,38)(34,42,43,51)(35,45,46,47)(36,49,50,52)(40,54,55,61)(41,56,57,48)(44,59,60,62)(53,63,64,58)(2,9)(3,14)(8,23)(10,18)(12,27)(13,15)(24,29)(26,28)(35,46)(40,55)(44,60)(45,47)(53,64)(54,61)(58,63)(59,62) involution — undirectedA 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.