DTM: Hagman's link above should answer most of your questions.

The only part I might disagree with is - I thought the Yank songwriters were the first to call it a Cadillac. I'm just not sure if or why they did so.

It wasn't long before the 1905 photograph was turned into a post card titled "Indians, up to date." No mention of Geronimo.

There is also much folklore about Geronimo actually driving the car in a faked buffalo hunt stunt at the same "Wild West Show." More post card fodder. The whole set isn't all that rare.

The 1972 album art I've seen is a tracing or drawing of the old post cards. Credit is to a William Holloway.