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