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