Children can color cat coloring pages by first choosing their colors. They can use water or semi-transparent colored pencils to color the cat in the color they like. They should carefully color the cat's fur, eyes, nose, and ears, paying attention to the details. They can add different patterns or spots to the cat to create a fun look. It's helpful for them to be patient during coloring and to lightly outline the outer lines first. Additionally, they can use a brush to add shading to the cat's fur with gentle strokes. Finally, they can complete the picture by adding a background such as a landscape or something else around the cat.