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