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