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