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