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