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