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