Convert method that returns an autoreleased CGColor to ARC

I'm in the process of converting my project to using ARC. I have a category on NSColor with a method that returns an autoreleased CGColor representation:

@implementation NSColor (MyCategory)

- (CGColorRef)CGColor
{
    NSColor *colorRGB = [self colorUsingColorSpaceName:NSCalibratedRGBColorSpace];
    CGFloat components[4];
    [colorRGB getRed:&components[0]
               green:&components[1]
                blue:&components[2]
               alpha:&components[3]];
    CGColorSpaceRef space = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
    CGColorRef theColor = CGColorCreate(space, components);
    CGColorSpaceRelease(space);
    return (CGColorRef)[(id)theColor autorelease];
}

@end

What is the correct way to do this with ARC? I don't want to return a retained CGColor.

The ARC converter in XCode suggest using

return (CGColorRef)[(__bridge id)theColor autorelease];

but that results in the following error message:

[rewriter] it is not safe to cast to 'CGColorRef' the result of 'autorelease' message; a __bridge cast may result in a pointer to a destroyed object and a __bridge_retained may leak the object