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