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