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