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