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