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