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