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