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