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