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