There is no specific list of diagrams which you must know. You can be asked to draw a diagram of any structure described on the syllabus. However the attached document gives a list of (to the best of my knowledge!) every diagram asked over the last 15 or more years.
Remember, you should be able to draw all diagrams in under 60 seconds. Don't bother colouring. Keep in mind the basic rule: Everything in roughly the right position, roughly the right size and roughly the right shape.