There are a few aspects to your image that highlight the noise, but two things stand out as most important:
1) The color on that picture is very saturated. Whether you're making the adjustment in photo editing software, or you have the camera set to make images very vivid, it is likely to bring out noise a bit more than a neutral image.
2) In your zoomed in example, you are displaying the image at an extremely high magnification, likely equivalent to making a photo print that is on the order of 4+ feet wide! Looking at images from a camera at 100% will show you all the detail the camera/lens/you combination can muster, but in the real world, stuff at 100% really doesn't matter very much.
3) One of the things that brings out noise in an image is actually white balance adjustment, particularly under light that is less than purely white. This could consist of a light bulb, sunset, or anything of the sort. For example, if the light is very blue (As shade is, outside), the camera will make the oranges/reds brighter in order to give the image a more neutral white balance. This will also bring out some noise in those color regions. This is why shady, out of focus areas can appear somewhat noisy at very high magnification.
4) Lastly, you should be happy that your camera is giving you the image, and not smearing all the details to cover up a little bit of noise that nobody actually cares about.