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