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