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