If your camera images, thumbnails, motion clips, and Live View are not showing up in color, it is likely that you have set the infrared (IR) illuminator to the On setting in the NIGHT VISION section of the camera settings.
When IR is set to "On", the camera is in infrared mode and the camera images will always appear in black and white. Infrared detects heat, which is displayed as shades of white.
To have a color image, the camera requires light in the visible spectrum and for the Night Vision setting to be "off" or "Auto".
When the Night Vision Control setting is "Auto", your camera will automatically switch from IR mode to visible light mode when the scene is bright enough.