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