How to color-code points in a scatterplot by a third, non-quantitative data category

I have three columns of data.

Two columns contain numerical data, which I want to plot on the x- and y-axis of a scatterplot.

That part's easy. It's the next part that trips me up.

I have a third column which contains categorical data. I want to use the values in this column to color-code all the "points" on the scatterplot.

For example, in the attached screenshot, I would like the points in categories "A", "B", and "C" to each be assigned a color.

I've tried a million things, but cannot for the life of me figure out how to do this. Any help would be much appreciated.

Thank you!