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