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