I have my wife's and my Google calendar set up to sync on my phone, however they both show up as the same color. They show up different on my computer, just not on my phone. How can I change them on my phone as well?
Open calendar
Open option menu from within the calendar app
Select 'Settings'
Select the calendar you wish to edit
Click the color block left of the calendar you wish to edit
That will open a "Calendar Color" palette, allowing you to choose from 24 different colors
Note: some of these references may vary based on your phone type (I'm using a Nexus 5, but was previously on S4, and believe it was the same).