No single color represents North America on a globe. Globe colors convey political boundaries, elevation, climate, or thematic data—not continental identity.
Continents are geological/geographical constructs, not political units. Assigning one color would obscure the very data (borders, terrain) globes are designed to show.
If you see a globe where North America is one solid color, it's a simplified educational model for young children—not a standard cartographic practice.