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