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