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