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