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