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