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