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