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