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