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