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