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