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