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