Do you mean a Saturn IV-B? Those were the third stages of the Saturn V. If so, the complete Saturn V was displayed horizontally outdoors for quite a while. I was in the US in 2018 and stopped by KSC too see a Falcon 9 launch, by then the complete Saturn V was in a building.
If you mean just the Saturn IV (no B), that was the second stage of some early Saturn rocket. I don't know much about those or if one was ever on display.
Sorry about my typo. I meant Saturn V. If you watch the video in the parent article, you'll see James Burke walking around it with the VAB in the background.
If you mean just the Saturn IV (no B), that was the second stage of some early Saturn rocket. I don't know much about those or if one was ever on display.