The anecdote about Puckett's 5-rail draw shot, which has already been posted, is on page 113 of "Gospool". There is no diagram and no indication of how the balls were placed. For example, we don't know if the cue ball was drawn straight back or if there was a near rail involved. No distances are given in the quote.
Unless we find someone who was there and still remembers it -- from the 1960s

-- I think the details will remain a mystery.
I did see an amazing draw shot, and since the setup was dead simple, it's easy to describe:
It's a spot shot. The standard test for spot shot draw it to draw the cue ball off the side rail and then across the table to the side pocket on the same side the object ball is pocketed. You use outside english to help the shot. The shot I saw, and which the shooter said he was going to try before he shot it, is almost the same. He drew the cue ball off that same side rail but then to the corner pocket at the head of the table. This was at the Blue Cue in Berkeley, probably in 1966, and it was the shorter desk guy who shot it. New Gold Crown with blue cloth.