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