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