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