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