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