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