Undoubtedly, an exception generation affects the control flow considerably. So the graphics for it should be identifiable at first glance. The other consideration is that there is something similar between a return and a raise statements. Both lead the control flow out of the current scope. So I decided to use the shape from the return statements and to add a red arrow icon for eye catching purposes.

As usual the raise statement may occupy many lines and may have leading and side comments as shown in the second example.