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