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)(25,26)(27,32)(28,30)(29,34)(31,33)(35,40)(36,37)(38,39)(1,2)(3,8)(4,6)(5,7)(10,15)(12,17)(16,21)(20,22)(25,27)(26,32)(28,36)(29,33)(30,37)(31,34)(35,39)(38,40) involution — undirected(1,3,5,6)(2,4,7,8)(10,15)(11,18)(16,21)(19,24)(26,33)(27,34)(28,35)(37,38)(9,11)(10,12)(13,19)(14,18)(15,17)(16,20)(21,22)(23,24)(25,28,31,35)(26,30,33,40)(27,36,34,39)(29,38,32,37)(1,2)(3,4)(5,7)(6,8)(9,12)(10,11)(13,22)(14,17)(15,18)(16,24)(19,21)(20,23)(25,29,31,32)(26,34,33,27)(28,38,35,37)(30,39,40,36)(1,4)(2,6)(3,7)(5,8)(9,13,14,23)(10,16,15,21)(11,19,18,24)(12,20,17,22)(25,30)(26,35)(27,37)(28,33)(29,36)(31,40)(32,39)(34,38)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.