One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,12)(4,9)(5,10)(6,20)(7,11)(8,14)(13,26)(15,22)(16,24)(17,25)(18,30)(19,23)(21,27)(28,31)(29,32)(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(1,3,6,14,7,15,5,19)(2,8,10,12,11,23,20,22)(4,13,18,27,17,28,16,29)(9,21,24,26,25,32,30,31)(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)(1,4,7,17)(2,9,11,25)(3,13,15,28)(5,16,6,18)(8,21,23,32)(10,24,20,30)(12,26,22,31)(14,27,19,29)(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)(1,5,7,6)(2,10,11,20)(3,14,15,19)(4,16,17,18)(8,22,23,12)(9,24,25,30)(13,27,28,29)(21,31,32,26)(35,45)(40,54)(44,58)(46,47)(53,63)(55,61)(57,64)(59,60)(4,17)(9,25)(13,28)(16,18)(21,32)(24,30)(26,31)(27,29)(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.