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