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