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