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