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)(27,33)(29,35)(31,38)(32,37)(34,39)(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)(25,26,30,28)(27,34,36,31)(29,32,35,37)(33,39,40,38)(2,5)(6,8)(12,21)(15,20)(18,24)(22,23)(25,27,35,40,30,36,29,33)(26,31,37,39,28,34,32,38)(1,3,4,7)(2,6,5,8)(9,12,13,21)(10,15,16,20)(11,18,19,24)(14,22,17,23)(25,28,30,26)(27,31,36,34)(29,37,35,32)(33,38,40,39)(11,19)(14,17)(18,24)(22,23)(26,28)(31,34)(32,37)(38,39) 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.