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