From the bit i gathered feeding your crays foods rich in animal proteins and of course color foods will bring out stronger red colors and feeding them algae or veggie rich foods will help bring out the blues.
That said when i bought my first "orange" crayfish he looked quite orange, like yours. Now he looks more red. And my whites will get more yellow, especially along their carapace, the closer they get to molting. I feed primarily cichlid pellets rich in animal proteins.
I'm hoping switching them to algae based foods will help keep my whites whiter and my C. quads blue, as they have developed a lot of red/purple compared to the near solid blue color they where when i first got them.
I also have a second orange, much lighter in color than the first. I'm hoping she stays the light orange color she is now.
Will be interesting to see what you get with yours.