Claris Organizer does not look at the work hours specified in your preferences when printing the Daily Graphical Calendar. The first time interval that prints is always at 8 am. For example, if you change your work hours in Preferences to 7 am, then set an appointment for 7 am, this appointment will be listed in the Early section at the top of the page.
The Daily Graphical places all appointments before 8 am in the Early section and all appointments after 11 pm in the Eve section.