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