Jeff,
I can't find a site for facing colours for the period you are looking for.This list is courtesy of Osprey's 'The British Army on Campaign (3):1856-1881'.
Vaughan is partly right – not many British regiments changed their facings after the Napoleonic Wars, but a few did.
Regimental Facing Colours up to 1881:
Blue: 1 LG, 2 LG, KDG, 4 DG, 1 RD, 2 D, 16 L, RE, Grenadier, Coldstream, Scots Gds, 1st, 2nd, 4th,6th, 7th, 8th,21st, 23rd, 25th, 35th, 42nd, 50th, 51st, 79th(from 1873), 85th, 87th, 100th, 101st, 102nd, 103rd, 104th.
Buff: 2 DG(cream), 3rd, 14th, 22nd, 27th, 31st, 40th, 48th, 52nd, 61st, 62nd, 71st, 78th, 81st, 90th, 105th.
Green: (Dark)5 DG, 68th, 73rd, 79th(until 1873).(Gosling)5th. (Lincoln) 11th, 45th, 49th, 55th, 63rd, 69th, 94th. (Grass)19th, 24th, 36th, 39th, 54th, 66th.
Yellow: 3 DG, 6 D, 9th, 10th, 12th, 15th, 16th, 20th, 26th, 28th, 29th, 30th, 34th, 37th, 38th, 44th, 46th, 57th, 67th, 72nd, 75th, 77th, 80th, 82nd, 83rd, 84th, 88th, 91st, 92nd, 93rd, 95th, 96th, 99th, 108th.
White: 17th, 32nd, 41st, 43rd, 47th, 59th, 65th, 74th, 98th, 106th, 107th, 109th.
Red: 33rd, 53rd, 76th.
Black: 7 DG, 58th, 64th, 70th, 89th.
Purple: 56th.
Sky-blue: 97th.
The following had Blue tunics:
Faced Red: RHG, 3 LD(converted to Hussars 1861), 4 LD, 5 L, 9 L, 12 L, 14 LD, RHA, RA, Ordance.
Faced Buff: 13 LD.
Faced White: 6 DG, 17 L, Militart Train.
Faced Blue: 4 H (from 1861), 7 H, 8 H, 10 H, 11 H, 14 H( from 1861), 15 H, 18 H, 19 H, 20 H, 21 H.
The following had Green tunics:
Faced Scarlet: 60th
Faced Black: Rifle Brigade.