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