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