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