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