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