Here’s a photograph of the St. Louis Giants’ Kuebler Park in 1909, from the Indianapolis Freeman (June 12, 1909).  It’s not a great image, but it is a pretty unusual shot of a Negro league game in progress with a broad view of the small ballpark.

And here, from the same page, is a team photo of the St. Louis Giants themselves.  Again, a bad image (you can barely make out their faces), though you can get a decent idea of what their uniforms looked like.