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