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