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