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