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