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