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