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