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