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