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