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