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