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