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