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