I think you have answered your own question - this was a live, improvised performance and there wouldn't have been any score for this tune, which is a very well-known standard and any Jazz pro would know the chords and the melody to this and have them memorised.
If you want to find the chords and melody - it's in many Real Books or Fake Books and I'm sure you could find this online. I did a quick google search and many lead sheets appeared - this was the first :
