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