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