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