Burger menu arrows in a different color

You must be referring to the arrows that open submenus. Unfortunately, none of the Enfold demos have this type of hamburger navigation. Otherwise, I could tell you the selectors based on that.

Why don’t you post the page in question? It’s much easier to give advice that way.
As mentioned above, unfortunately there is no demo page where this hamburger variant is set.

find the menu-item and :

.menu-item-556 .av-submenu-indicator {
  color: green;
  font-size: 40px;
}

.menu-item-556 .av-submenu-indicator:before {
  content: "\E875";
  font-family: 'entypo-fontello';
}

the last rule is for heaving a littel bolder icon