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