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