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