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