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