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