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