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