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