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