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