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