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