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