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