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