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