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