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