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