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