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