Left handed chord diagrams
Although I am right handed, a question I've been asked is, "Do you teach left handed players?" The answer is Yes. When teaching left handed player, the student is effectively looking into a mirror when you face them and demonstrate technique. As for resources, although most of my resources are drawn right handed, here are a few left handed chords to get started.
Left handed vs Right Handed
Basically, if you want a left handed diagram, then flip the image for the right handed player 180 degrees horizontally. To get an idea, look at the chords on this page and their right handed equivalents on the Beginner Chords page to see how they are different. This should give you an idea on how to use the rest of the right handed material on this website but for left handed use.