First question - are you using a driver with Airprint in the name - that's a minimum-options driver.
On my Epson's print dialog, lower right side, there is a pull-down menu with all the options in it. This menu has a horizontal line extending through it - I guess to show that something else can appear below.
Inside that pull-down, I have several categories of added menus. For mine (there are lots of variations in these categories), there is one called "Print Settings." When I click on that, I get a menu with "Advanced" as a choice near the bottom. I click that. Then for Print Quality, I can choose Economy, Normal, or Photo.
I would select Economy for draft. But again, this is for my model Epson, yours may be slightly different.
I don't use Airprint on My Macs - it's original intended use was for mobile devices - iPad, iPhone, etc.