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