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