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)(12,18)(13,16)(14,15)(19,21)(20,24)(22,23)(25,26,30,33)(27,31,35,29)(28,36,38,32)(34,37,40,39)(1,3,5,8)(2,6,4,7)(9,11)(10,12)(13,19)(14,18)(15,17)(16,20)(21,23)(22,24)(10,15)(11,18)(16,23)(19,24)(25,27,30,35)(26,29,33,31)(28,34,38,40)(32,37,36,39)(9,11)(10,12)(13,19)(14,18)(15,17)(16,20)(21,23)(22,24)(25,27)(26,31)(28,34)(29,33)(30,35)(32,39)(36,37)(38,40) involution — undirected(1,2,5,4)(3,6,8,7)(9,12)(10,11)(13,21)(14,17)(15,18)(16,24)(19,23)(20,22)(25,28,30,38)(26,32,33,36)(27,34,35,40)(29,37,31,39)(1,4,5,2)(3,7,8,6)(9,13)(10,16)(11,19)(12,20)(14,22)(15,23)(17,21)(18,24)(25,29,30,31)(26,27,33,35)(28,37,38,39)(32,34,36,40)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.