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