Mercury doesn't really sparkle with color. The colors in this image show information about where different rock types are located. To the human eye, Mercury would look mostly gray. The large bright yellow round area is called the Caloris basin. It is one of the largest impact basins in the solar system, formed when an asteroid collided with Mercury billions of years ago.
This image was taken by NASA's MESSENGER spacecraft.
Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington