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