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