Preview print dialog defaults to Scale to Fit or Print Entire Image
As a run around, you can print it from terminal. Assuming your default printer is the one you want

lp -o fit-to-page /path/to/file.pdf


or by dragging and dropping the pdf onto the printer, which should print it at 100% and auto-rotated "fit to page". It depends on the pdf's size and rotation settings, but you'll find it works most of the time.

If you don't have you printer as a dock icon, you can find it in

~/Library/Printers/yourprintername