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