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