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