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