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