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