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