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