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