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