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