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