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