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