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