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