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