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