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