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