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