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)(11,21,12,16)(13,26,28,18)(14,20)(15,19)(17,25,31,23)(22,30)(24,35)(27,39,40,34)(29,32)(33,37)(36,38)(2,5)(6,8)(9,11,15,12)(10,16,19,21)(13,22,28,24)(14,25,29,23)(17,32,31,20)(18,30,26,35)(27,37,40,36)(33,39,38,34)(9,12,15,11)(10,17,19,31)(13,24,28,22)(14,23,29,25)(16,20,21,32)(18,33,26,38)(27,36,40,37)(30,34,35,39)(2,5)(6,8)(9,13)(10,18)(11,22)(12,24)(14,27)(15,28)(16,30)(17,33)(19,26)(20,34)(21,35)(23,36)(25,37)(29,40)(31,38)(32,39) 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.