One vertex per element, one color per generator, with an edge from x to x·s.
(3,7)(6,8)(10,13)(11,15)(18,20)(22,24)(25,26)(27,31)(28,30)(29,36)(32,37)(33,35)(34,40)(38,39) involution — undirected(1,2,5,4)(3,6,7,8)(10,13)(14,16)(19,23)(22,24)(26,28)(27,33)(32,36)(34,39)(9,10)(11,14)(12,13)(15,16)(17,18,21,20)(19,22,23,24)(25,27,30,33)(26,31,28,35)(29,34,37,39)(32,38,36,40)(1,3)(2,6)(4,8)(5,7)(9,10)(11,14)(12,13)(15,16)(17,19)(18,22)(20,24)(21,23)(25,28,30,26)(27,31,33,35)(29,32,37,36)(34,40,39,38)(1,4,5,2)(3,8,7,6)(9,11,12,15)(10,14,13,16)(17,20,21,18)(19,24,23,22)(25,29,30,37)(26,32,28,36)(27,34,33,39)(31,38,35,40)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.