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)(25,26)(27,35)(28,33)(29,34)(30,31)(32,36)(37,40)(38,39) involution — undirected(1,2)(3,6)(4,7)(5,8)(9,11)(10,16)(12,13)(14,19)(15,18)(17,23)(20,21)(22,24)(27,36)(29,37)(32,35)(34,40) involution — undirected(1,3)(2,5)(4,8)(6,7)(10,12)(11,18)(17,20)(19,24)(25,27,31,36)(26,32,30,35)(28,37,39,29)(33,34,38,40)(1,2)(3,5)(4,7)(6,8)(9,12,15,10)(11,13,18,16)(14,20,22,17)(19,21,24,23)(25,28,31,39)(26,33,30,38)(27,29,36,37)(32,40,35,34)(1,3)(2,6)(4,8)(5,7)(9,13)(10,11)(12,18)(14,21)(15,16)(17,19)(20,24)(22,23)(25,29)(26,34)(27,28)(30,40)(31,37)(32,38)(33,35)(36,39) involution — undirected(1,2)(3,5)(4,7)(6,8)(9,14)(10,17)(11,19)(12,20)(13,21)(15,22)(16,23)(18,24)(25,30,31,26)(27,35,36,32)(28,38,39,33)(29,34,37,40)A 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.