When using the PS3 controller as a gamepad, how can I turn it off properly

Microsoft has changed the looks of its controllers over time.

For instance, my original wireless controller from my Elite looks identical to the images you showed, and says Microsoft twice on the top of the controller (one hologram, one etched in).

My newer wireless controller, that came with the Wireless adapter for Windows, is all black, and only has the hologram on the top with Xbox 360 etched in the top.

On both controllers, the hologram is right above the battery pack, so it may be located in a different location on a wired controller.

Because the PS3 game controller never was designed to be used with a computer, there have never been any computer games that has visualized the PS3 game controller button mapping layout.

Microsoft's close relationship to PCgaming (also through enabling it with extra accessory) has enabled the company to integrate the layout of the Xbox controller in most games. Sony's PlayStation division never wanted anything to do with PC gaming, Microsoft enabled it out of the box with their 360 Wired controller.

Your request is not possible without serious modding (in which case basically anything can be done).