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