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