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