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