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