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