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