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