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