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