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