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