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