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