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