How to connect front audio panel cables to my motherboard

In the above picture you can see following pins. 

• The front panel audio connectors consists of:
• Yellow- MIC BIAS
• Green - SPKOUT R
• Peach - MIC In
• Blue - Return L
• Black - Ground
• White - SPKOUT L
• Grey - SPKOUT L

For example, FoxConn 975X7AB-8EKRS2H front audio connection seem like this:  

• MIC IN®
• GND
• MIC POWER (L) (single orange wire)
• LINE OUT RL
• LINE OUT FL
• LINE OUT FR
• LINE OUT RR

here is a pic of the manual that came with the case

Usefull reference links:

Front Panel Audio Connection Illustrated guide 01

Front Panel Audio Connection Illustrated guide 02

More Pictures for understanding