To create more impactful explanatory visuals, develop the habit of using color in a purposeful way. When applied thoughtfully, color is arguably the most important decision you make when focusing your audience’s attention where you want it.
One way to start is by overriding the default color palette of your data viz tool and start with nothing emphasized.
Using color for emphasis is important. Color is a pre-attentive attribute, so it’s great to take advantage of that powerful implicit signal. And that means not using lots of different colors.