The Lotus at the center symbolizes the presence of the Almighty in the form of Lord Krishna. The various colours provides us the vital energy to take the right action as uttered by the Lord,

             karmanyevaadhikaraste ma phaleshu kadachana  I

             ma karmaphalaheturbhurma te sangaostvakarmani  I

“Thou hast a right only to action, never to its fruits; let not the fruit of thy work be thy motive, neither let there be any attachment to inactivity.”     ….Srimad –bhagavad Gita