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