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)(11,13,17,15)(12,16,22,24)(19,21,20,23)(25,26)(27,35)(28,34)(29,39)(30,32)(31,33)(36,37)(38,40)(3,7)(5,8)(9,11,14,17)(10,13,18,15)(12,20,22,19)(16,23,24,21)(25,27,32,31)(26,33,30,35)(28,36,39,38)(29,37,34,40)(1,2)(3,5)(4,6)(7,8)(9,11)(10,15)(12,19)(13,18)(14,17)(16,23)(20,22)(21,24)(25,28,32,39)(26,34,30,29)(27,36,31,38)(33,40,35,37)(1,3)(2,5)(4,7)(6,8)(9,11)(10,13)(12,19)(14,17)(15,18)(16,21)(20,22)(23,24)(25,29)(26,28)(27,37)(30,39)(31,40)(32,34)(33,36)(35,38) involution — undirected(1,2)(3,5)(4,6)(7,8)(9,12)(10,16)(11,19)(13,21)(14,22)(15,23)(17,20)(18,24)(25,30,32,26)(27,33,31,35)(28,29,39,34)(36,40,38,37)(9,13)(10,17)(11,18)(12,21)(14,15)(16,20)(19,24)(22,23)(25,31,32,27)(26,33,30,35)(28,38,39,36)(29,37,34,40)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.