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