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)(15,19)(18,24)(20,22)(21,23)(25,26,30,29)(27,32,34,31)(28,33,36,37)(35,39,40,38)(3,7)(6,8)(10,12)(15,17)(16,20)(23,24)(27,34)(28,36)(31,32)(33,37) involution — undirected(1,2,5,4)(3,6,7,8)(25,27)(26,31)(28,35)(29,32)(30,34)(33,38)(36,40)(37,39)(1,3,5,7)(2,6,4,8)(9,11,14,19)(10,15,12,17)(13,21,22,18)(16,24,20,23)(25,27)(26,32)(28,35)(29,31)(30,34)(33,39)(36,40)(37,38)(1,4,5,2)(3,8,7,6)(9,12,14,10)(11,17,19,15)(13,20,22,16)(18,24,21,23)(25,28,30,36)(26,33,29,37)(27,35,34,40)(31,38,32,39)(9,13,14,22)(10,16,12,20)(11,18,19,21)(15,23,17,24)(25,29,30,26)(27,32,34,31)(28,37,36,33)(35,39,40,38)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.