Currently the Cassini spacecraft is orbiting Saturn during Saturnian Winter unlike when Voyager sped by in the 80’s when it saw an almost globally peach colored Saturn. During this winter, the rings tend to keep the region in shadows and the theory goes that this lowers the temperatures and break up the peach colored clouds and “clear” the skies to reveal this blue. If this is the case, we are seeing deeper into the atmosphere here than we do in the areas blanketed by the more peach colored top clouds.
The image shows the northern pole of Saturn and those bands are the shadows of the rings on the cloud tops. You can see some smaller cloud formations in between the shadow gaps which gives a very alien Saturn some Earth-like familiarity.