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