Looking OpenGL 3.0 spec, Section 4.4 Page 291,

The following base internal formats from table 3.15 are color-renderable:
ALPHA, RED, RG, RGB, and RGBA. The sized internal formats from table 3.16 that
have a color-renderable base internal format are also color-renderable. No
other formats, including compressed internal formats, are
color-renderable.

you can find it in table 3.15

Base Internal Format    RGBA, Depth, and Stencil Values     Internal Components
------------------------------------------------------------------------------- 
     RGB                    R,G,B                              R,G,B
It suggest that the  RGB format is color-renderable.

you can find it in table 3.16

Sized Internal Format    Base Internal Format   R bits    G bits   B bits   A
bits 
shared bits
------------------------------------------------------------------------------- 
RGB32F                   RGB                    f32       f32     f32

According to description, as Sized Internal Format the Base Internal format of
RGB32F is RGB,  RGB format is color-renderable according to description of
table 3.15, So RGB32F should be color-renderable