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