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