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