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