Follow these steps to set Clips Colors in a bin:
Put your bin into Text View. Notice the column of squares to the left side of the clip's name. These are the color swatches.
Select the clips and/or sequences.
Once selected, set the color with one of the following methods:
Right-click on the color swatch of one of the selected items and make a selection from the palette
Go to the Edit menu, and select Clip Color, and make a selection from the palette
In the Timeline Window, to display the colors you've assigned to the clips in the bin. Go to Timeline Window Fast Menu (the hamburger-looking icon in the bottom left side of the Timeline Window) | Clip Color | Source.