Create a logo-style image in the style of Diego Rivera. Use bold, vibrant colors and a mural-like composition. Feature a group of young graduates wearing caps and gowns, holding their diplomas, and smiling. Arrange them in a semi-circle or a dynamic line to create a balanced composition. Include a large graduation cap at the center top with the word "Congratulations" in a stylized, hand-painted font. Add elements such as banners and streamers to enhance the celebratory atmosphere. Use strong outlines and detailed shading to reflect Rivera's artistic style, incorporating a sense of movement and energy in the scene.