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