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