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