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