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