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