Is there a sketch/map of the "name of God" trap from Indiana Jones and the Last Crusade somewhere on the Internet? I can't find one.
Here is a screen capture from the movie. I got this from Desert-Sky.net "zip file 5" file: 921. This was the most complete screen shot I could find, and I don't own the movie to determine more.
This looks very different from what was portrayed in the comic strip on a different answer. For one thing the letters are not in square boxes in rows, but follow more irregular shapes.
Here are the panels from the comic adaptation. I don't know how accurate the comic was to the film, however:
I have this book but unfortunately nothing about the "name of god" trap. You can anyway find quite a lot of pictures from props (mainly Henry Jones Sr. Grail Diary pages) coming from this book and a lot of others on this (excellent) page. Quite an amount of great pictures.
But as Henry Sr. didn't see the trap before, he had no drawing on it in his diary.
On all the pages I've seen here and there on the Internet, we can see a lot the Leap of Faith special effect making of but alas nothing about the Name of God trap other than the picture already provided by Jeffrywith1e.