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