Yes, these images are part of the Code of Federal Regulations. They appear in the print version. (Jen helpfully provides a link to this.)
"Forms and illustrations" are submitted for publication in the Federal Register by including with the document "a clear and legible original form or illustration, or a clear and completely legible reproduction approximately 8 1/2 by 11 inches". 1 CFR § 18.10. This would include documents submitted for inclusion in the Code of Federal Regulations pursuant to 1 CFR § 21.1.
However, these diagrams do not have the same legal weight as the text of the CFR does. 44 USC § 1510(e) provides:
The codified documents of the several agencies published in the Code of Federal Regulations under this section, as amended by documents subsequently filed with the Office and published in the daily issues of the Federal Register, shall be prima facie evidence of the text of the documents and of the fact that they are in effect on and after the date of publication. (emphasis added)
Therefore, images and diagrams are a part of the CFR and are included in the print editions, but unlike the text they arguably do not constitute prima facie evidence of the law.