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