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