It doesn't really add much of a highlight to the Gantt chart, but you can turn on another bit of information to show violations. Go to View->View Options and you'll see that there are controls for configuring what information is displayed on the Gantt chart. One of the choices offered is a violation count, which will show a number representing the number of violations relating to the task or milestone. You might also turn on the Critical Path highlighting to show that the violations actually matter.
A trivial example showing the violation count on both a task and a milestone, plus the use of the Critical Path highlighting:
