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