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