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