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