One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,12)(5,14)(6,10)(8,13)(9,15)(11,16)(17,18,24,30)(19,31,35,57)(20,26,39,53)(21,40,44,55)(22,29,23,28)(25,45,49,34)(27,43,56,42)(32,50,63,59)(33,64,67,48)(36,47,62,76)(37,69,41,71)(38,58,46,52)(51,73,54,70)(60,74,80,66)(61,75,65,77)(68,79,72,78)(1,3,6,4)(2,7,10,12)(5,13,15,11)(8,9,16,14)(17,19,22,34,24,35,23,45)(18,25,28,31,30,49,29,57)(20,36,38,32,39,62,46,63)(21,33,42,66,44,67,43,74)(26,50,52,47,53,59,58,76)(27,48,40,60,56,64,55,80)(37,68,70,61,41,72,73,65)(51,78,69,75,54,79,71,77)(1,4,6,3)(2,8,10,16)(5,11,15,13)(7,14,12,9)(17,20)(18,26)(19,32)(21,41)(22,38)(23,46)(24,39)(25,47)(27,54)(28,52)(29,58)(30,53)(31,59)(33,65)(34,62)(35,63)(36,45)(37,44)(40,71)(42,73)(43,70)(48,77)(49,76)(50,57)(51,56)(55,69)(60,78)(61,67)(64,75)(66,68)(72,74)(79,80)(17,21,23,43,24,44,22,42)(18,27,29,55,30,56,28,40)(19,33,45,74,35,67,34,66)(20,37,46,73,39,41,38,70)(25,48,57,80,49,64,31,60)(26,51,58,71,53,54,52,69)(32,61,36,68,63,65,62,72)(47,75,50,78,76,77,59,79)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.