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