Because you're looking for a week that starts on Monday instead of Sunday, you can't just group on the date field and display for every week. So, I would try creating a formula that looks something like this:
If DayofWeek({table.date}, crMonday) > 1 then
{table.date}-DayofWeek{table.date}, crMonday) + 1
else
{table.date}
This looks at the day number in the week based on the week starting on Monday. Group on this formula to group your data by week.
-Dell