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