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