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