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