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