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