Change Tracking Options
You can customize how you
would like to track and display the changes. You can even select
the colors.
Try it: Change the Tracking Options
Go to Review -> Tracking.
Go to Track Changes.
Select Change Tracking Options.

What Do You See? At the top of the list are the
Markup options. By default, the color is assigned by Author.
Anything that is deleted is formatted with a strikethrough
like this.