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