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