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