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