In Shwetambar Jain Navpad (Siddhachakra) / Ayambil Oli, the 9 pads and their main colours are:

1. Arihant Pad – White
2. Siddha Pad – Red
3. Acharya Pad – Golden Yellow (Yellow/Orange tone)
4. Upadhyaya Pad – Green
5. Sadhu Pad – Black

1. Samyak Darshan (Right Faith) – White
2. Samyak Jnan (Right Knowledge) – White
3. Samyak Charitra (Right Conduct) – White
4. Samyak Tap (Right Austerity) – White

So:

• Center Arihant = White
• Top Siddha = Red
• Right Acharya = Golden Yellow
• Bottom Upadhyaya = Green
• Left Sadhu = Black
• Four corners (Darshan, Jnan, Charitra, Tap) = all White

You can read more detailed explanation of each pad and colour here:

• Arihant, Siddha, Acharya, Upadhyaya, Sadhu, Samyak Darshan, Samyak Jnan, Samyak Charitra, Samyak Tap series articles:
• Overview of Shri Navpad Ayambil Oli and its significance: