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