Change the style and colors for your graphic within the theme for your presentation.
Now, explore the world of design that's available for SmartArt graphics. Work with galleries of styles and color variations to make a graphic look professional and polished. See, too, how the overall design of the presentation, called a theme, affects the design of your graphics.
Style and color variety exist at the level of individual shapes and text within a graphic, too. Visual effects such as shadows and glows can be applied to selected shapes and their text, to make them stand out.
Finally, learn how to deal with diagrams that you have from older presentations. Do you want to upgrade them to look like SmartArt graphics? Or do you want them to retain their original appearance? Get an idea of your choices and what to expect.