When in Lisp mode, the LispWorks editor provides automatic Lisp syntax coloring and parenthesis matching to assist the editing of Lisp programs.
You can ensure a buffer is in Lisp mode as described in Automatic entry into lisp mode.
To modify the colors used in Lisp mode syntax coloring, use the Styles tab of the Editor tool's Preferences dialog as described in the Common LispWorks User Guide . Adjust the settings for the styles whose names begin with "Lisp".