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