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