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