There is one in the Workout Manager under Popular Rotations (4th one down) entitled:
31/2 Month STS + Newer Cardio. I put this together in 2017 so it is more recent than the one Cathe posted in '09. Here is what is in the general description:
This rotation gives you all 36 STS workouts in sequence so you cover all 3 mesocycles and build awesome muscular endurance, definition and strength. You will do the STS workouts on Monday, Wednesday and Friday. I put in an active recovery week between each mesocycle. You will also build great cardio fitness, endurance and fat burning through 3 cardio workouts/week. The cardio workouts are programs Cathe has produced since STS (2011-2017). Low impact hiit training is on Tuesdays, steady state cardio on Thursdays and high impact hiit training is scheduled each Saturday. Steady state cardio rotates between kickboxing, spin and step workouts. Core/ab training is fit in twice per week on your cardio days. Cardio workouts have been carefully selected so that they do not negatively impact building muscle. Sundays are for yoga/stretching or a day of well-earned rest.
If you like this structure but want to use something more recent than 2017, you can always switch out the low impact hiit workout I selected for a different one on any given Tuesday, a different steady state workout on Thursdays, or a newer high impact hiit workout of your choice on Saturdays. Similarly you can change up the core or yoga/stretching programs when they come up on the rotation if you want to use more recent programs or you don't like the one I have selected. Hope this helps. Good luck with STS! It is so amazing!