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