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