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