One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,12)(3,18,20,72)(4,25,28,86)(6,14,39,62)(7,13,35,67)(8,15,36,63)(9,17,37,65)(10,44,45,80)(11,51,54,90)(16,70,64,40)(19,49,78,59)(21,52,85,117)(22,73,83,118)(23,74,33,99)(24,76,84,109)(26,66,88,125)(27,68,34,101)(29,58,96,60)(30,56,92,121)(31,55,93,120)(32,87,94,119)(38,103,104,123)(41,53,102,61)(42,105,82,128)(43,75,100,127)(46,91,114,79)(47,115,111,89)(48,107,112,81)(50,108,113,95)(57,106,122,77)(69,126,110,98)(71,116,124,97)(1,3,9,24)(2,10,17,50)(4,26,32,89)(5,33,37,100)(6,38,27,22)(7,42,41,21)(8,43,40,23)(11,52,58,105)(12,59,65,112)(13,66,53,47)(14,69,68,46)(15,49,16,48)(18,71,76,55)(19,77,81,30)(20,70,84,36)(25,74,87,75)(28,91,94,126)(29,95,90,80)(31,98,97,79)(34,85,39,82)(35,83,102,104)(44,106,108,92)(45,63,113,64)(51,107,96,78)(54,118,60,123)(56,73,57,103)(61,114,67,110)(62,111,101,125)(72,119,109,86)(88,116,115,93)(99,120,127,124)(117,121,128,122)A 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.