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