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