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)(19,32)(23,38)(24,34)(27,33)(29,40)(30,37)(31,36)(35,39) involution — undirected(2,6)(7,8)(9,11)(10,17)(12,16)(13,29)(14,24)(15,25)(18,21)(19,33)(20,34)(22,26)(23,31)(27,30)(28,38)(32,39)(35,37)(36,40) involution — undirected(1,3,5,4)(2,7,6,8)(9,12,14,25,15,24,16,11)(10,18,20,34,21,17,22,26)(13,27,30,29,31,39,32,23)(19,35,36,40,37,33,28,38)(1,4,5,3)(2,8,6,7)(9,13,14,30,15,31,16,32)(10,19,20,36,21,37,22,28)(11,23,12,27,25,29,24,39)(17,33,26,38,18,35,34,40)(2,6)(7,8)(9,14,15,16)(10,20,21,22)(11,24,25,12)(13,30,31,32)(17,34,18,26)(19,36,37,28)(23,39,29,27)(33,40,35,38)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.