Try to use a themed coloring. For example, a series of coloring books about animals, buildings or machines give children an idea of the objects of the world. Coloring of fairy tales or cartoon characters, are good because they allow the child to "talk" with their favorite characters and express their attitude towards them through colors.
Speech therapy coloring is designed to secure the child in the speech of certain sounds. They develop fine motor skills, phonemic hearing, attention, perseverance.