There are charts out there, like the one below, that go by tire size and weight and give some guidelines. The weight across the bottom is total wheel load, not your weight. So, at my weight of 225 plus 25 lbs of bike and gear is 250 lbs. If I say 60% of the weight is on the rear wheel, that gives me about 150 lbs, which would say a bit under 90 psi for 32 mm tires.
If you look
here, I think Continental says 85 - 102 PSI for the 32mm tires. The max on the sidewall on mine say 102.
I use 32mm GP 5000's and run them at 80 psi because I found over years (before the GP 5000s) that dropping to 80 did not make a difference in speed on the roads I ride on and did seem to increase the time between flats.
You are lighter, on the chart below looks like you could run lower than 75.
Last year I did the Seattle to Portland ride on a rental bike road bike with 32mm tires - did 123 miles the first day and felt great. I had forgotten to check the tires the first day, that night I saw they were only inflated to 70 PSI! Psychologically, that made me feel slow - after not feeling slow at all for 123 miles! I pumped them up to 80 for the final 83 miles, couldn't really tell the difference.
