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