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