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