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