Records of the Adjutant and Inspector General's Office are located in the National Archives Record Group 109. However, I do not believe the GO you're looking for will be found there.

I suggest you contact the Old Army Archivists at the NA.

Acccording to a "Guide to the Archives of the Government of the Confederate States of America," we find:

"AIGO General Order 131 of Oct. 3, 1863, announced that the names of those considered worthy of medals and badges were to be inscribed in a roll of honor to be preserved in the Ajutant and Inspector General's Office. Such a roll accompanied the order, and another was published with General Order 64 of Aug. 10, 1864: others are in the Official Records . . . Armies. No actual medals appear to have been issued, however."

Following this paragraph is the following list of documents:
Bauman L. Belden, War Medals of the Confederacy (New York, 1915); C.S.A. War Department, Articles of War for the Government of the Army of the Confederate States (Montgomery, 1861); Thomas Park, "The Confederate Roll of Honor, "Chronicles of Oaklahoma, 34:234-238 (Summer 1956); William M. Robinson, Jr., Justice in Grey; a History of the Judical System of the Confederate States of America, p. 359-382 (Cambridge, Mass., 1941)

Good hunting,

George Martin
Sparks, NV