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