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