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