ToggleColorManager.cs

using UnityEngine;
using UnityEngine.UI;

public class ToggleColorManager : MonoBehaviour
{
    [Header("Elements")] 
    public Toggle toggle;
    public Image icon;

    [Space(16)]
    [Header("On State Colors")] 
    public ColorBlock colorBlockOn;
    public Color colorIconOn;
    
    [Space(16)]
    [Header("Off State Colors")] 
    public ColorBlock colorBlockOff;
    public Color colorIconOff;

    private void Start()
    {
        UpdateColorSets(toggle.isOn);
    }

    public void UpdateColorSets(bool b)
    {
        if (b)
        {
            toggle.colors = colorBlockOn;
            icon.color = colorIconOn;
        }
        else
        {
            toggle.colors = colorBlockOff;
            icon.color = colorIconOff;
        }
    }
}