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