You can refresh the data now by clicking ‘Refresh Immediately’ button or schedule the hourly or daily refresh by setting the time and clicking ‘Save’ button. You can cancel anytime by selecting ‘None’ for Frequency.
The color indicates whether the majority of people in each county voted for Republican Candidate - Donald Trump (Red) or Democratic Candidate - Hillary Clinton (Blue).
I have downloaded the data from a Github repository called "County_Level_Election_Results_12-16" maintained by Tony McGovern (https://twitter.com/tonmcg). The 2016 data there was originally scraped out of Townhall.com's 2016 election result page.