The center of mass can be displayed by going to the Evaluate ribbon and clicking on Mass Properties.
In the dialogue box, enable the checkbox for "Create Center of Mass feature".
The center of mass will need to be shown by going View->Hide/Show->"Center of Mass".
The center of mass will appear in the part as shown in the picture below.
The center of mass can be shown in the drawing as well. To do so, make sure the center of mass feature exists in the model being used for the drawing. Then expand the FeatureManager to show the center of mass feature. Right click on it and select show.
The drawing will the have the center of mass and reference dimensions can be created to it