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