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