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