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