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