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