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