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