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