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