Firstly, it wasn't Graceland (no s, by the way). The meeting took place at Elvis' home in Bel Air, California on August 27, 1965.
Secondly, all of the Beatles are on record saying that no tape player was running nor any pictures taken; I tend to believe them. If it had been recorded, we'd have heard at least a bit by now.
It's a shame, as this would be an amazing listen ...