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)(37,43)(38,40)(39,53)(41,48)(42,51)(45,59)(46,61)(47,54)(50,57)(52,56)(55,63)(58,60)(62,64)(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)(34,40)(35,45)(42,49)(43,53)(46,60)(47,48)(56,57)(62,63)(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)(33,35,39,48,38,45,37,47)(34,41,43,44,40,54,53,59)(36,46,50,62,51,60,52,63)(42,55,57,58,49,64,56,61)(1,5,7,6)(2,9,10,14)(3,12,4,13)(8,15,11,16)(20,28)(23,32)(25,27)(29,31)(33,36,38,51)(34,42,40,49)(35,46,45,60)(37,52,39,50)(41,55,54,64)(43,57,53,56)(44,58,59,61)(47,63,48,62)(1,6,7,5)(2,9,10,14)(3,12,4,13)(8,16,11,15)(19,26)(22,30)(25,27)(29,31)(33,37,38,39)(34,43,40,53)(35,47,45,48)(36,50,51,52)(41,44,54,59)(42,56,49,57)(46,62,60,63)(55,61,64,58)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.