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