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