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