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