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