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