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