This is one way to do it. I'm certain there are others.
Paste this into the sheet level module of the sheet you want to 'color'.
You can change the vbColor should you want one sheet colored different from the others.
Code:
Option Explicit
Private Sub Worksheet_Activate()
Application.ScreenUpdating = False
With Application.ActiveSheet
Cells.Select
With Selection.Interior
.Pattern = xlSolid
.PatternColorIndex = xlAutomatic
.ThemeColor = xlThemeColorDark1
.Color = vbYellow '<-- change color here
.PatternTintAndShade = 0
End With
End With
Application.ScreenUpdating = True
End Sub