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