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