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