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