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