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