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