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)(11,13)(12,16)(14,15)(17,22)(18,21)(19,23)(20,24)(25,26)(27,31)(28,34)(29,32)(30,33)(35,39)(36,40)(37,38)(1,3,6,7)(2,5,8,4)(10,15)(11,17)(12,19)(20,21)(27,28)(31,34)(35,36)(39,40)(1,4)(2,7)(3,8)(5,6)(10,15)(11,17)(12,19)(20,21)(25,27,30,28)(26,31,33,34)(29,35,38,36)(32,39,37,40)(1,2)(3,4)(5,7)(6,8)(9,11,14,17)(10,13,15,22)(12,18,19,24)(16,21,23,20)(25,28,30,27)(26,31,33,34)(29,36,38,35)(32,39,37,40)(1,5,6,4)(2,7,8,3)(9,12,14,19)(10,16,15,23)(11,18,17,24)(13,21,22,20)(25,26)(27,34)(28,31)(29,37)(30,33)(32,38)(35,39)(36,40)(1,2)(3,5)(4,7)(6,8)(9,13)(10,17)(11,15)(12,20)(14,22)(16,18)(19,21)(23,24)(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.