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