I love this free printable from Layers of Learning. She writes:
Using a copy of the Constitution go through the “Three Branches by the Constitution” worksheet. Each of the powers granted to the Federal Government are written in the boxes on the worksheet. Color code each box to show which entity of the government has the specific power mentioned. You’ll have to consult the Constitution for the answers.
The Legislative branch should have two colors in the same color family to designate it, like orange and yellow, and the President and vice president should also have two colors in the same color family to represent them, like dark blue and light blue. The Supreme Court justices can all be in the same color, like green. Many of the legislative functions are shared by the House and Senate, these can be colored with both orange and yellow.
If you like, you can obtain and print portraits of each of the people currently in office to paste into the boxes. Images should be about 80×100 pixels and can be re-sized with photo editing software or using Paint.
Head on over to print your B&W copies!