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