One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,10,18)(3,19,27,67)(4,28,32,85)(5,33,37,91)(6,15,40,59)(7,14,39,60)(8,17,9,16)(11,42,48,22)(12,49,52,30)(13,53,57,20)(21,71,75,118)(23,64,81,113)(24,63,80,114)(25,66,26,65)(29,86,88,107)(31,89,41,58)(34,55,70,56)(35,54,36,90)(38,61,94,51)(43,98,100,116)(44,97,103,68)(45,96,102,76)(46,77,47,78)(50,87,108,93)(62,105,111,73)(69,84,106,125)(72,83,95,124)(74,120,82,112)(79,115,123,110)(92,126,117,109)(99,121,104,128)(101,119,127,122)(1,3,20,68,7,24,35,77,8,25,70,96,40,81,37,42,10,27,53,97,39,80,36,78,9,26,34,76,6,23,5,22)(2,11,33,64,15,45,55,65,16,46,90,114,60,103,57,67,18,48,91,113,59,102,56,66,17,47,54,63,14,44,13,19)(4,21,69,116,30,73,93,122,41,82,117,128,94,123,88,95,32,75,106,98,49,105,87,119,31,74,92,121,38,79,29,72)(12,43,84,71,28,83,86,115,61,104,126,120,89,127,108,111,52,100,125,118,85,124,107,110,51,99,109,112,58,101,50,62)(1,4)(2,12)(3,21)(5,29)(6,38)(7,30)(8,41)(9,31)(10,32)(11,43)(13,50)(14,58)(15,28)(16,61)(17,51)(18,52)(19,62)(20,69)(22,72)(23,79)(24,73)(25,82)(26,74)(27,75)(33,84)(34,92)(35,93)(36,87)(37,88)(39,49)(40,94)(42,95)(44,101)(45,83)(46,104)(47,99)(48,100)(53,106)(54,109)(55,86)(56,107)(57,108)(59,85)(60,89)(63,112)(64,71)(65,115)(66,110)(67,111)(68,116)(70,117)(76,121)(77,122)(78,119)(80,105)(81,123)(90,126)(91,125)(96,128)(97,98)(102,124)(103,127)(113,118)(114,120) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.