You can create a unique symbols map using the Layer Properties dialog.
The Unique Values classification displays features by applying a different color to each unique value for a specified field.
How to make a unique symbols map:
Click a layer in the legend to make it active.
Click the Layer Properties button.
Click Unique Symbols.
Click a Field.
Click a Color Scheme.
Click a Style.
Check Remove Outline to remove the outline on features.
Click an entry in the Symbol column to change its color.
Double-click a value in the Label column to select it. Enter a new value.
Click OK to close the dialog box and see the changes.
Tip: For a unique symbols map, you can change the label of each value by typing a new value in the Label column. Be sure to press Enter after adding each new value.