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