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