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