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