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